A magic angle spinning 13C NMR study of 13CO-labelled tricarbonyl(hexahapto-hexamethylbenzene)chromium(0) and tricarbonyl(hexahapto-durene)chromium(0)
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Add time:07/29/2019 Source:sciencedirect.com
At 293 K, the slow magic angle spinning carbonyl subspectrum of crystalline 13CO-labelled tricarbonyl(hexahapto-hexamethylbenzene)chromium(0) (1) displays an extensive manifold of spinning side bands. These have been analysed to yield the principal elements of the shielding tensor which are appropriate to an axially symmetric anisotropy pattern. In contrast, only a single signal at a position corresponding to the isotropic chemical shift is observed at 293 K for the carbonyl carbon atoms of 13CO-labelled tricarbonyl(hexahaptodurene)chromium(0) (2). The intensity of this signal is highly temperature-dependent and the changes are considered in the context of the known crystal and molecular structures of 1 and 2.
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